I'm using the TFV4 on a single rba deck and it does perform awesome for me. The only complaint I have is the the holes where you put the wire. I'm using 28 gauge ni200 so I'm able to fit it under the screw heads but I doubt a lower gauge would hold under there.
I wish it had slots like the dual deck.
It is a large diameter but if you want clouds from a tank and unrestricted airflow then the TFV4 is awesome.
The crown might be a good one as well and has loads of good
reviews but I'm waiting for mine and the RBA deck is hard to get in the UK right now.